Typewriting machine



Feb. 4, 1930: A. G. F. KuRowsKl TYPEWRITING MACHINE Fiied June 5. 1924 Patented Feb. 4, y193.0

f UNITEDv STATES PATENT OFFICE AEERED G. RV'KUROWSKI, OE BROOKLYN, NEW YORK, AssieNoR To UNDERWOOD ELLIOTT EIsHER'ooMPANY, OE NEW YORK, N. Y., A CORPORATION OE DELAWARE TYPEWRIT'ING MACHINEy Application filed .Tune 5, 1924. Serial No. 717,994.

This invention relates 'to typewriting ma-y ',chines, `and is hereindisclosed as applied to 4'an Underwood portable typewriting machine wherein the typing elements arermounted upon a stationary support, and the platen is mounted on a carriage. Y f

A feature of this invention is the provision of guide-rollers to engage the end-plates of the shift-frame to eliminate vibration resulting from letter-feeding movements of the,

in place.

Another feature'includes the provision of a shift-key lever, one end of the lever being arranged to act against means associated with the lower portion of the shift-frame, to throw said frame to upper-case position with a comparatively ylight and easy pressure' upon the shift-key.

This application discloses `a case-shiftframe adjusting or truing means identical with that disclosed Yin my application Serial No. 699,420, filed March 15, 1924, now Patent No. 1,67 3,687 ,dated J une 12, 1928.

Other features and advantages will hereinafter appear. n j- In the accompanying drawings,

Figure 1 is a left-hand side elevation of the typewriting machine,with portions broken away, andother parts omitted.`V Figure 2 is a plan view of the eXtreme lefthand section of the machine indicating a portion of the carrying case in dot-and-dash lines.

Figure 3 is a side view of the carriage-shifting frame, yshowing its link connection to the frame kof the machine.

Figure 4 is a [fragmentary view looking from the frontof the machine, showing the carriage-counterbalancing spring and its connectionsl Figures 5 and 6 are detail views of parts of the mechanism.

Figures 7 and 8 are details of the eccentric adjustments of the carriage shift arms.

In the illustrated embodiment of the invention, 10 indicates a complement of keylevers arranged in four banks as customary for a standard keyboard, each key-lever operating abell-crank 11 that swings on a fulcrum wire 12 to operate a connection 13 linked to a type-bar 14 arranged to throw the typebar to the printing position at a platen 15. Each type-bar is provided with twol typefaces and pivoted to a slotted segment 16 fixed to the frame 16 of the machine. The platen is provided with a traveling. carriage 17 mounted on a shift-frame 18 comprising endkplates 18 joined together by a back plate 19 having ears 20 that are riveted to said plate, as indicated at 20. This three-sided shift frame18 is hung or suspended from the forward ends of two links 21 and 22 arranged at each side of said shift-frame.V A reinforcing plate 23 may be arranged to face against the inner side faces of the frame 16 and be secured thereto by means of suitable screws, as shown.

Each of t-he links 21 and 22 is so connected that each may be adjusted forward or back independently of all the other links. For this purpose one end of each link is mounted upon an eccentric pivot which is adjustable to change ythe eccentricity thereof. In the ing the links withy the main frame is shown particularly in Figure 8. The link 21 is connected to the main frame by a pivot 24 having an annular groove 25 intermediate its ends engaged by a set-screw 26 threaded through the main frame. This screw prevents longitudinal movement of the pivot, while permitting rotation thereof, and it is turned by rpresent instance the eccentric pivot connectgaged by a set-screw 31 to rotatably connectk the same with the main frame. The link 22V is journaled on a reduced portion of a rock shaft 32 between Jche shoulder formed by saidreduced portion and the adjacent side of the frame 16. Vhen either pivot 24 or 29 is turned, the eccentric portion thereof is shifted angularly,'and the'effecjtive' 'length' of the adjacent'link, that is, the distance between vthev axes of its pivots is changed. Thus-tomove the shift-frame toward or from the typing system, the ends of the sh'iftframeV maybe simultaneously or independently moved, as

may bedesired. Also thel -fframe fama-y be' ad'- juste'd' angularly,E andit may bei tilted' for? wardly or rearwardly by increasing or dimi`n`` -'the links 22.

This adjustable connection betwen-the main frame andv the 'carriage shift-iframe permits an exact positiningV of'. the carri`agewith" re# spect tothe segment-`^16', so'that the p latenprinting line maybe 'brought fintocoinc'idencewith thepri`nting`1plane ofthe typefaesfand' without= the necessity' for a'ny'change in the position? of the"segmentij yThe linksf21-aref curved upwardly andi'forwardly toilpafss un; der 'th'e carriage', and' 'the freel 'en'd's 'secured vvithlav shouldered screwf21" threaded' into the' end-plates18.V Y The' links include hubs pinned t'o/th'ie rock-shaft '32, which-'in the linl terestf"flightnessi'n structure, comprises" a tubehungat each end `upon the pivot 29 -pr'ol vided'ineach side of thefra'me 165.' The forward ends'oi` the' links 22 supporta fixed stud 34 that is r'educedat theffreeendto 'receive'a roller'heldf thereon byja screw 36 threaded into'the end of the stud. This stud 34 forms a second" support .forith'e end plates 18'? by entering'an open slot 37 formed inthe lower edge ofthe plates and held lagainstaccidentalY displacement by'a latch 38"]nounted toswi'ng uponl a pivot screw 39, and bear againstfthe f inside'favceof the plates 18'; An open'slot 84a in the'latch 38 is arranged to engage with the stud 34ytoY lock itin operative position within saidslot,` orto release the stud'so thatthecar- 'riage-frame may be disengaged vfrom thelinks 22"and lifted clearoffth'e machine," Thelocking orrel'ea'se Aposition yof the latch' g38`1nay acting tov `clamp the"l latch to the face of the plates 18. yA linger-piece 38 provides means whereby the latch 38 may be readily shifted.

In order'to'provid'e a free and accurateup-f* and-down movementof' the carriage, an anti; f friction roller 41' 1s mounted between ears' ing within a circular groove: inthe latch and 42 forming part of brackets 43 fixed to the lower edge of the frame 16 at the'two sides of the machine. Each bracket extends inwardly under the links 22, and is then curved upwardly to bring its roller against the inside face of the adjacent end plate 18. Hence the up-and-down movement of the carriage is guided by the contact of the plates 18, and the rollers 41 on the inside of the shift-frame. Numeral 44 indicates a tongue secured to each plate lSand formed with a bent-over end to provide a stop element'45. y This stop element shifts with the frame and limits its movement in two direct-ions through abut- 'ment with a pair of 1oppositely-,disposed'adustable stops 46 and""47 "mounted" upon' ad# jacentparts of thestationary frame 16.

In the normal position of the carriage,

fwherethe printingline is in alignment with the lower-case typeV or small letters, the stop element' 451of the carriage-frame will :rest

upon the lower adjustable stopi47 througlrthe weight -ofthecarriage andfits associated partsf i.

yThis dead weightis usuallyso great asztolpro; mote a hardcarrla'ge-shifting movementfof the shift-keys indicated at 56,"and it is the'usual practice'to provide counterb'alancingelements to relievethe shift-'keys of fmostof this'burden. To vthis end the rock-shaft 32 is provided with aspiral spring'48having one vendfse-i-v cured, 11n' any suitable.' manner; toa bracket "f :49 fixedrto the vbackframe 50-of the machihef and the opposite en'dsseculred to' a-sleeve"51- adjustablyf mounted 'upon' said"shaftfandfi Y .forniedjwith ratcheteirown teeth'aadapted to l :interlock withisimilar teethf `53^ina collar:54"

pinned ftol the-shaft.' v f 32 toraise the forward'ends 'of the 'link`s122 and' liftA theJ Y carriage away" from lthe" lower- -Jsleeve'fl and `collar'v54 in engagement' witlr each other and also reacts through the {shaft lT1105 stop 47 Thee-Xtentfofthis lifting power pf l the spring is determined bylth'e' 'tension given the spring by turning the sleeve 51 to wind shift-key V56 is usuallyAv provided l'adjacent Veach sid'e pf the keyboard, so that shifting yofthe carriage .may beaccomplis'hedlby either T `or unwind thecoils,fandfanyadjustment 'mayv be made permanent bya set-screw 55. One 1 hand.kr This shift-key, contraryto the-usual practice, doesl not extend rearwardly the 4full f depth of theimaehine similarly'tothe key-y -levers, but isfulcrumed to the sideframefas '-at57, providing a lever of the'ir'st `order.

The shift-key, 'atv-the forward" end, hasthe samegeneralcontourastheikeylevers inthe first or lower ban-k vand extends' rearwardly,

where the free end 56"passesundertheroller 85v of the )stud-34. ASaid roller yfope'rates' against a cam-face formed in thefedge' 'of the f end 56,an'd` enables -an operator't'o raise-the platen and carriage-byacomparativelylight v and easypressure upon theshift-key. Y' -Ea'chl shift-key: may be :provided vwith a spring 57'. connected to some part of the frame, as

. indicated at 58, the spring acting to hold said key in its normal yposition against av stopplate59 secured to the inside face of a front y comb 60. 1

61 is a shift-lock key-lever pivotally hung from a stud 462 on the face of the shift-key 56 directly at the rear of the comb 60. The shift-lock lever 61 is provided with a spring 63 connectingfsaidy lever with an ear 64 formed in the-upper vedge'of the lever of shift-key 56, and normally holds the lever of vkey 56 and the lever 61in aligned position through the abutment of an ear 65 on the lever 61 striking against the under edge of the lever of shift-key 56. Vhen the lever of key 56 is depressed, the lever 61 is carried along with it and both are restored by the spring 57, but, when the lever 61 is depressed, the initial motion will lleX the spring 63 and the lever will turn about the stud 62 until an upright linger .66 bears against the rear face of the stop-plate 59. From this point to the end of the stroke, a down movement of the lever 61 will depress the key 56 until the movable stop element 45 strikes the stationary stop 46 to complete the carriageshifting movement. At this point the upper edge of the linger 66 has almost passed under the lower edge of the stop-plate 59, and with a little eXtra pressure on the lever 61 will Y spring the parts sufficiently to pass the end of the linger 66 under the stop luntil the movement is arrested by an ear 67 striking the upper adjacent edge of the key 56. This effectually locks the stop element against the stop 46 for an indefinite period, which isdesirable when the character of the work calls for a continuous use of capital letters. When it is desired to return to normal printing, the depression of the key 56 beyond the position lixed by the lever 61 will relieve the tension of the linger 66 against the stop 59,

and permit the spring 68 to restore said lever 61, and both levers will return to .normal position under the tension of the spring 5" To properly adjust the co-operation of the linger 66 to the stop-plate 59, the latter may be adjustably secured to the front comb by screws 60. A portable machinev is usually provided with a carrying case within which the machine lits snugly, and without any loss of space, and, as the carriage is always wider than the frame of the machine with carriage 'f rails of equal length on the frame, it is necessary that the carriage be adjusted to a ceni i tral position relative to the base and 4frame before inserting the machine into its case. To promote a quick and accurate alignment of the carriage prior to its being placed in the carrying case, indicated` in Figure 2 by dot-and-dash lines at C, a locking lever 68 is pivotally hung from a projecting part of the frame 16 and providedwith a finger-button 69 and a detent70 to co-operate with a detentpin 72 in one position, or at a forward position where an outstanding linger 7 8 formed on the lever enters afslot 74 in the edge of a shift-frame carriage-rail 75. In this position a similar slot 76 in the moving front carria-ge-rail 77 aligns with the slot 74, so that the carriage assumes a central p osition with relation to the frame 16. Due to the fact that the tongue enters both slots in the rails, and is spring-pressed therein, the carriage is elfectually prevented from shifting longitudinally or vertically. Furthermore, the locking lever 68 functions as a carriage-position locator, that is, by throwing said lever forwardly, so that the detent is under tension of the spring 71 and the linger 73 bears against the carriage-rail 77, the carriage may be shifted from any position laterally along the rails until the slot 76 of the carriage-rail registers with the finger, at which time the finger will be projected into said slot'76, due to action of the spring 71, thus simultaneously locating the proper position of the carriage and locking the same against accidental movement in all directions.

No claim is herein made to features which are common to this application and my copending application No. 148,286. The claims in this case are limited to features which are not disclosed in said application 148,286.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim 1. Ina typewriting machine, the combination with a main frame and a case-shift frame mounted for movement therein, of a pair of brackets mounted adjacent the lower side edges of the main frame, said brackets extending under lthe edgesk of the shift-frame and provided at their freey ends withrollers arranged to contact with the inner walls of said `shift-frame to brace the same against vibrational movement and provide guiding means therefor during shifting operations.

2. In a typwriting machine, the combination with a main frame and a case-shift frame mounted for movement therein, of brackets carried by the main frame, said brackets eX- tending under the sides of the shift-frame and having means contacting with the inner sides of said shift-frame to guide the same during shifting operations.

3. In a typwriting machine, the combination with a main frame, a case-shift frame including a pair of side p'lates, each having a slot adjacent its lower edge, a pair of swingable connections between the mainr frameand the side plates, and a pin carried by the free end of each of said connections, to engage the slot, of locking members pivoted for movement on the side plates, said locking members each having a slot arranged to receiveztlieapineoarriedfby tl'ie adjacent eonnection, .f :said 'slot z in each. looking gmemberdi-y rected. at,l right .angles to said iirst-mentionedv slot tozpivotally seourethe pinrto-.itsadja-'i oent side plate, and meansforholdingeaeli looking member-into or out of engagement.y

withv said pin, .the vlocking ygmenibe'rg` -vvheii oluding` a pair of side .plates,eaolihavinga i 1,745,494;I i

7. Ina;typewritingniaoliine,a main frame,i v

` a oase-shift -.framef,a pairfof connections,.bef-.v ftvveen the yframes to move thesliit-'frame connection to said-Acasefslii'trame, .anda

rearwardlyas it is moved upward-ly, ,onefend of each of said connections including a pii 1.n

caseeshift lever fulorumedyfor movement Iont t the mainframe, said leveracting against the o changeits position upon said lever.

ALFRED G, F; KUROWSKI.

slot adjacent its loweruedgef, al pair of swing# r able connections between the' main Jframe and:y

tlierside .pla-tes; anda pin'foarrie'd bythe freea4 end'ofieaolixof said connections, to engage thev v slotg, :of looking members "pivote-d for: move` mentf yon the Vside plates, said; locking mein-y 0 ,lpei's'reaoh having a slot arranged' to ireeeive the s .pin `carried by- ,1 the z adjacent connection, ,i said slotineaoli looking member ydireotedat i'igntmnglesto .said `firstfinentioned': slotf to pivotally secure the zpinitotlie adjaentzsidev.

Jlatet said;l1ockiin0f membersieaoh havin@r an 7 C I b arcuate slot arranged.; around-:itsepivotal Y poiiit51andfa setfsereW' passing through said slotifntoithe adjacent side platetoprovide a A limitingv stop forisaid. looking. member When-z:

swungfrm one position lto i another, and to 1 liold said Vmember ineitlieri of saidpositioiis. Y,

5. In Va typewritingfmachine, .tlie Combination with. a main rame,..a oase-,shift frame including a pairofrsdefplates, eachv having Y a SlOtadjaCent: its flovveredge", a pairfof swingable connections between the main frameand theazsiderplates, and a pin in:the.free vend of each of said connectionsxtoi engage theslot, oflockinglmemberspivoted for movement 'on .l the side plates, said :looking members each having,y ya slot arranged. toi engage' the adjaoentpimsaid slotin the Elooking membersdireeted at right angles to said inst-mentioned slot: to pivotallyseeurethe pin tothe adjaentfside plate, said locking members each having an arcuate slot arranged aroundjits'` pivotal'.` point,A andrwa 'set-sorevv passing f throughl said slot into tlieadj acent'side plate to.;provide .a limiting stop `tor the'vlocking-i:

member When sivungfrom one position to anotlier,za11d` toiliold. said member in either of said'y positi'oiis,rasaid looking members eaclii-y providedbnrits upper edge Witli' an ear Abent overito Aprovide a `finger-piecefor'adjusting` the positions of said. looking member.'-

Gx'In: a typevvritingmaoliinmia main frame. a oaseeshiftgframe, a connection link .pivoted at -onesend to-tlie .main frame, thev otherlend of saidl link provided with a pin Connectionto 'saidic'aSe-slii'ft yframe, a roller uponv the pin, and Ia case-shiftlever -ulcrumed' for movementon the main frame, :saidv'leverincluding an-'end formed tvitliv a camming. face to Contact With the'roller and impart motion to pin connection.v to :lift tlieioase-sliift 1 frame While permittingwsaidfrpin conneotionfritoiw 

